value怎么是any
<body>
<p>字数限制在30字内，<span>您还可以输入<b>30</b> 字</span></p>
<textarea cols="50" rows="7" id="text"></textarea>
<script type="text/javascript">
var text = document.getElementById("text ");
var total = 30;
var b = document.getElementsByTagName('b')[0];
console.log(b)
document.onkeyup = function () {
let len = text.value.length;
console.log(len);
allow = total - len;
b.innerHTML = allow;
}
</script>
</body>
weixin_慕的地4584504浏览 773回答 0
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慕斯4360584
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慕慕5436299
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莲_蓶濏__
var text = document.getElementById("text"); // 去掉空格
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